Diphoton production at hadron colliders: transverse-momentum resummation at next-to-next-to-leading logarithmic accuracy

被引：29

作者：

Cieri, Leandro ^{[1
,2
]}

Coradeschi, Francesco ^{[3
,4
]}

de Florian, Daniel ^{[5
]}

机构：

[1] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[2] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy

[3] Ist Nazl Fis Nucl, Sez Firenze, I-50019 Florence, Italy

[4] Univ Florence, Dipartimento Fis, I-50019 Florence, Italy

[5] Univ Buenos Aires, FCEYN, Dept Fis, RA-1428 Buenos Aires, Argentina

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2015年 / 06期

关键词：

QCD Phenomenology; Hadronic Colliders; DRELL-YAN PROCESS; HIGGS-BOSON PRODUCTION; PHOTON PAIR PRODUCTION; ONE-LOOP CORRECTIONS; ANALYTIC CONTINUATION; PARTON DISTRIBUTIONS; SPIN ASYMMETRIES; Q(T) SPECTRUM; ORDER; LHC;

D O I：

10.1007/JHEP06(2015)185

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We consider the transverse-momentum (qT) distribution of a diphoton pair produced in hadron collisions. At small values of qT, we resum the logarithmically-enhanced perturbative QCD contributions up to next-to-next-to-leading logarithmic accuracy. At intermediate and large values of qT, we consistently combine resummation with the known next-to-leading order perturbative result. All perturbative terms up to order alpha(2)(S) are included in our computation which, after integration over qT, reproduces the known next-to- next-to-leading order result for the diphoton pair production total cross section. We present a comparison with LHC data and an estimate of the perturbative accuracy of the theoretical calculation by performing the corresponding variation of scales. In general we observe that the effect of the resummation is not only to recover the predictivity of the calculation at small transverse momentum, but also to improve substantially the agreement with the experimental data.

引用

页数：22

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